<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
    <style>
      body {
        color: #666;
        text-align: center;
      }
      .dog {
        width: 200px;
        height: 200px;
        margin: 50px auto;
        cursor: pointer;
        opacity: 0.5;
      }
    </style>
    <style>
      /* 在这里完成作业 */
      .dog:hover{

      }
    </style>
  </head>
  <body>
    <img src="doge.jpeg" alt="doge" id="doge" class="dog" />
    <p>移动鼠标到图片上</p>
  </body>
</html>
